Commercial use of residential property in Kolkata — and in Salt Lake, which the Supreme Court named separately — is the subject of this article, written for owners who let out a flat, a house or a Salt Lake plot. If you own a flat, a house or a Salt Lake plot in Kolkata and let it out, the 2026 Supreme Court drive on commercial misuse of residential premises now reaches the Kolkata Municipal Corporation and, by name, the Bidhannagar Municipal Corporation. As of 10 September 2026 neither has published an affidavit, a survey count or any enforcement action under this case. What it has instead is a new civic procedure for this exact problem, dated 4 September 2026.
What the Supreme Court ordered
In Loganathan v. State of Tamil Nadu, Justices Ahsanuddin Amanullah and R. Mahadevan on 25 March 2026 impleaded the municipal corporations of every State and Union Territory capital and directed a survey of "areas demarcated exclusively for residential use, but are being misused for non-residential purposes", with affidavits personally affirmed by the Commissioners by 15 May 2026 (LiveLaw). On 20 May 2026 it ordered fresh action-taken affidavits, required "immediate and effective measures, including sealing, demolition, or any other action warranted in law", and gave statutory appellate authorities three months to clear pending cases. On 4 August 2026, having warned officials in July they would be "personally liable", it impleaded every State and Union Territory through their Chief Secretaries.
Where Kolkata stands
West Bengal appears in the record through Salt Lake, not through Kolkata. The 20 May 2026 order records that "the Bidhannagar Municipal Corporation, Salt Lake City, West Bengal, is also required to be heard in the present proceedings", and directed the Registry to issue notice, putting it on a short list of bodies named individually. The KMC was not named; it is bound through the blanket capital-city impleadment of 25 March 2026. New Town, under the NKDA, appears in no published order.
As of 10 September 2026 no KMC or Bidhannagar affidavit has been published, no borough-wise or ward-wise figure released, and no sealing or demolition in Kolkata or Salt Lake attributed to this order. No Calcutta High Court petition, West Bengal government statement or residents' association reaction has been reported. An affidavit on the record is often never reported, so silence is not proof of default — but Bidhannagar was noticed only on 20 May, making its first affidavit the document to look for.
Two things did happen this month, neither presented as compliance. On 4 September 2026 the KMC formalised a standard operating procedure for unauthorised change of use, set out below; no source links that SOP to the Supreme Court order, though subject matter and timing coincide. On 9 September 2026 it issued closure notices to 919 guest houses, having inspected 960 of roughly 3,700, for inadequate fire-fighting systems and absent licences — fire-safety and licensing enforcement, not a land-use finding.
The rules that apply in Kolkata
The KMC procedure of 4 September 2026 runs as follows. A Sub-Assistant Engineer's inspection identifies deviation from the approved plan; the inspection report, demolition sketch and infringement statement go to the Executive Engineer; a show-cause notice issues under sections 416(5) and 400(1) of the KMC Act, 1980; the party deposits security equal to 50% of the retention fee before the hearing; the Special Officer (Building) may order full demolition, partial demolition with retention, or retention of the unauthorised use; and an appeal lies within 30 days to the Municipal Building Tribunal. Officials who deliberately fail to detect a violation face action under section 21(3). Behind it sits section 401: the Commissioner may stop work and recover costs as arrears of tax, and "no Court shall entertain any suit, application or other proceeding for injunction" against him.
The KMC Building Rules, 2009 classify buildings by occupancy: a purpose taking more than 50% of floor area becomes the "principal occupancy" (Rule 2(40)); Rule 32 bars occupation without a completion certificate. The nearest numeric trigger is Rule 59, requiring 2.4 m of access where a residential building's non-residential component is under 10% of floor area and 7.0 m at 10% or more — an access rule, not a use-permission rule, but in practice the point at which a residential building starts being treated as mixed-use.
The Kolkata trade licence — the Certificate of Enlistment under section 199 of the KMC Act — covers "every profession, trade or calling". It requires one identity proof and one occupancy proof, and the accepted proofs include a rent receipt or an electricity bill (KMC procedure). On the face of that list, nothing in the process tests the building's sanctioned use — an inference from the requirements, not a stated rule. A valid trade licence does not cure a change-of-use breach.
Salt Lake is a different regime. Plots are held on 999-year State leases administered by the Land Manager, Bidhannagar, split between older 17-clause deeds and later 20-clause deeds carrying transfer restrictions (lease summary; State form). Because the freehold sits with the State, breach of a residential-use covenant puts the lease itself at risk, not just the structure. A commonly cited account of the conversion route describes a 45% cap on built-up floor area, five-year approval blocks and ₹80 per square foot; those figures rest on one secondary source and are to be confirmed.
What it means for owners and tenants
The near-term risk is not sealing under this order, none having been published, but the ordinary machinery now written down: an inspection, a show-cause notice, and a retention-fee security of 50% payable merely to be heard. In Salt Lake the exposure is heavier, the lease covenant sitting above the building. No figure for rental or occupancy impact in Kolkata or Salt Lake has been published, and none should be assumed.
The appeal route is the Municipal Building Tribunal, within 30 days, with a writ petition before the Calcutta High Court behind it. On 17 September 2024 the Supreme Court gave West Bengal two weeks to complete the Tribunal by appointing judicial and technical members, warning it would otherwise ask the High Court to initiate contempt; a chairperson was in place but the Tribunal was non-functional. Whether it is now fully constituted has not been published. That is West Bengal's clearest exposure: the three-month direction of 20 May 2026 expired on 20 August 2026, on pain of contempt.
What to do this month
- Pull the sanctioned plan and completion certificate, and compare sanctioned use against actual use.
- Work out what share of floor area is non-residential, against the 10% and 50% marks in the KMC Building Rules, 2009.
- Ask every tenant for a current Certificate of Enlistment; a valid licence is no answer to a change-of-use question.
- Check the property-tax slab: a commercial tenant in a property taxed as residential is the cheapest way to be found.
- For a Salt Lake plot, read the lease deed, establish whether it is 17-clause or 20-clause, and check any conversion permission.
- If a show-cause notice is in hand, diary the 30-day appeal period and file within it.
This is general information, not legal advice; take advice on your own property.
What to watch
The next Supreme Court hearing is reported for 15 September 2026. Three things would move Kolkata's position: Bidhannagar's first affidavit, overdue since it was noticed on 20 May 2026; any statement on whether the Municipal Building Tribunal is constituted and clearing appeals; and whether the 4 September SOP produces borough-wise show-cause figures. Until one appears, Kolkata's exposure runs through the SOP and the trade licence, not through this order.
Navoasset manages residential and commercial property in Bhubaneswar, where the same Supreme Court order has produced 4,632 notices and a new trade-licence rule; many of our owners live in Kolkata or own property here. We are tracking every State capital because the same order applies to all of them — the city-by-city tracker is at /insights/supreme-court-commercial-use-residential-property-tracker-2026/.
